/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Returns all nodes in all graphs of the specified class
template<class T> static void GetAllNodesOfClass ( const [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Blueprint, [TArray](API\Runtime\Core\Containers\TArray)< T * > & OutNodes )